Volvo high voltage problem

i have a 2006 volvo vnl670 with an ISX. Lately my cluster started acting up. The display part will lose lighting and voltage will raise to 24v!! At that point the high battery voltage warning comes on and sometimes ecu maintanance will come on as well. Once i got pissed off and hit the dashboard and everything started working again which made me come to the conclusion that it is not the alternator (which is new by the way). When i hit the dashboard the voltage gradually comes back down to 14.1 and all warning lights go off. I thought it must be a rubbed wire somewhere so i took the dash apart and started digging. No luck. Anyone ever had a similar problem?

 

Still found no solution but cluster cuts in and out on bumps. Funny story, so its 3:30am on i94 and I am driving through Chicagos not so greatest neighborhoods and i get pulled over for a roadside inspection. Now Illinois State Police has increased their patrols throughout the city because of the amout of shootings going on within the highways. (Truck driver got shot as a random victim not long ago). My cluster went out in Ohio and did not come back up. I was nervous thinking the cop will write me up since my entire cluster is a black abyss. As the state trooper approches my truck i punch the cluster with my fist and my entire cluster lights up like a christmas tree. I pass the inspection with flying colors i get back on the highway and my cluster shuts off. Someone from upstairs was looking out for me. The state police is supposed to have a larger presence to keep the citizens of Chicago safe, instead all they do is pull trucks over all night long. I drive mostly at night and there are always a boat load of trucks getting inspected at 2-3am

 

Level 3

 

No it does not. The alternator is brand new and the votage coming out of it is good.